required.
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Unit shall be a factory fabricated and tested assembly for air-to-air
energy recovery by transfer of sensible heat from exhaust air to supply air
stream. Device performance shall be according to ASHRAE 84. Device shall
deliver an energy transfer effectiveness of not less than [70] [85] [_____]
percent with cross-contamination not in excess of [0.1] [1.0] [_____]
percent of exhaust airflow rate at system design differential pressure,
including purging sector if provided with wheel. Exchange media shall be
chemically inert, moisture-resistant, fire-retardant, laminated,
nonmetallic material which complies with NFPA 90A. Exhaust and supply
streams shall be isolated by seals which are static, field adjustable, and
replaceable. Equip chain drive mechanisms with ratcheting torque limiter
or slip-clutch protective device. Fabricate enclosure from galvanized
steel and include provisions for maintenance access. Recovery control and
rotation failure provisions shall be as indicated.
2.10.2
Run-Around-Coil
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NOTE: Delete "factory fabricated and tested" if not
required.
Coordinate with paragraph Glycol Solution in Section
15181. Glycol is considered a hazardous waste. If
the base does not have a used glycol waste program,
using glycol can be an expensive maintenance item..
**************************************************************************
Assembly shall be factory fabricated and tested air-to-liquid-to-air energy
recovery system for transfer of sensible heat from exhaust air to supply
air stream. System shall deliver an energy transfer effectiveness not less
than that indicated without cross-contamination with maximum energy
recovery at minimum life cycle cost. Components shall be computer
optimized for capacity, effectiveness, number of coil fins per inch, number
of coil rows, flow rate, heat transfer rate of [_____] percent by volume of
[ethylene] [propylene] glycol solution, and frost control. Coils shall
conform to paragraph AIR HANDLING UNITS. Related pumps, and piping
specialties shall conform to requirements of [Section 15652A COLD STORAGE
REFRIGERATION SYSTEMS] [Section 15556A FORCED HOT WATER HEATING SYSTEMS
USING WATER AND STEAM HEAT EXCHANGERS] [15602N REFRIGERATION EQUIPMENT FOR
COLD STORAGE] [_____].
2.10.3
Heat Pipe
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NOTE: Include face air velocity, static pressure
drop, temperature requirements for entering and
leaving air or exhaust streams on the equipment
schedule for heat pipes.
Delete flexible connectors if not required.
**************************************************************************
Device shall be a factory fabricated, assembled and tested, counterflow
arrangement, air-to-air heat exchanger for transfer of sensible heat
between exhaust and supply streams. Device shall deliver an energy
transfer effectiveness not less than that indicated without
SECTION 15895
Page 52
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